The IUPAC name(s) of the above compound is(are): 1-chloro-4-methylbenzene, 1-methyl-4-chlorobenzene, 4-chlorotoluene, 4-methylchlorobenzene

The IUPAC names of the following compound are (A) 1-chloro-4-methylbenzene and (C) 4-chlorotoluene. In IUPAC system the name toluene (as a derivative of benzene) is acceptable. Toluene has a chlorine substituent on fourth carbon atom of the aromatic ring. The names 1-methyl-4-chlorobenzene and 4-methylchlorobenzene are incorrect as the ligands are not named in alphabetical order. The name 1-methyl-4-chlorobenzene is incorrect because methyl substituent has got lowest locant whereas Cl atom should get priority over methyl substituent. Hence, the correct options are A and C.